Can't send data to the textBox control through keypad

[Jussi]

I have a Windows Application project which is registered for the COM Interop
and Output type is Class Library. My class is as follows:

namespace WSure
{
//COM events interface
[GuidAttribute("60273D79-A957-4bb0-9FED-04DD2CED811C"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatc h)]
public interface IDXMachEvents
{
// ....
}

//COM methods interface
[GuidAttribute("CFAA1FE3-0FDF-4f6a-8346-7365D21B871C")]
public interface IDXMachMethods
{
[ DispIdAttribute(1)]
bool IsItTrue();
}

//CoClass
[Guid("066F6D2E-05E1-46bf-B1E2-CC753FAEDA2C"),
ClassInterface(ClassInterfaceType.AutoDispatch),
ComSourceInterfaces(typeof(IDXMachEvents))]
public class WDXMach : System.Windows.Forms.Form, IDXMachMethods
{
// ...

public System.Windows.Forms.TextBox textBox1;

// ...
public bool IsItTrue()
{
this.textBox1.ReadOnly = false;
this.Show();
return true;
}
}

I use this class library from the ATL COM object (C++) in which I create
WDXMach:

HRESULT hRes = m_pDXMach.CreateInstance(__uuidof(WDXMach));
if ( FAILED( hRes ) )
{
return E_FAIL;
}

Then I call

VARIANT_BOOL bValue = m_pDXMach->IsItTrue();

This works fine and finally I have on the screen a form with one textbox
control in it. The problem is that I can't edit the textbox with keypad. It
is possible
to copy and paste data in the textbox with mouse, but it just not respond
key strokes. Thanks a lot in advance for any help on the subject.

-Jussi